Ye Wantang accidentally transmigrated into a book, becoming a spy who needs to conquer the tyrant Xie Yunchen in order to survive. Upon entering the palace, she instantly found herself deep within the treacherous and unpredictable harem, where every step was a trial. Facing the emperor's unpredictable temperament and the schemes and harassments of those in the harem, she did not blindly fawn, relying instead on her clear-minded intellect to calmly navigate the situation. On one hand, she cautiously accumulated the tyrant's favorability to defuse one crisis after another that followed closely behind; on the other hand, she still had to conceal the secret of her own identity, striving to forge a lifeline of stability deep within the inner palace.